Phototoxic assessment of a sunscreen formulation and its excipients: An in vivo and in vitro study.

Background: Cosmetic preservatives are used to protect cosmetic formulations and improve its shelf-life. However, these substances may exert phototoxic effects when used under sunlight.

Objective: To assess safety, efficacy and putative phototoxic effects of a sunscreen formulation SPF 30 and its excipients.